Public Types¶

using const_iterator = const value_type *
using const_pointer = const value_type *
using const_reference = const value_type &
using const_reverse_iterator = std::reverse_iterator< const_iterator >
using difference_type = ptrdiff_t
using iterator = const_iterator
using pointer = value_type *
using reference = value_type &
using reverse_iterator = const_reverse_iterator
using size_type = size_t
using traits_type = _Traits
using value_type = _CharT

Public Member Functions¶

template<contiguous_iterator _It, sized_sentinel_for< _It > _End>
requires same_as<iter_value_t<_It>, _CharT> && (!convertible_to<_End, size_type>)constexpr basic_string_view (_It __first, _End __last) noexcept(noexcept(__last - __first))"
constexpr basic_string_view (const _CharT *__str) noexcept
constexpr basic_string_view (const _CharT *__str, size_type __len) noexcept
constexpr basic_string_view (const basic_string_view &) noexcept=default
constexpr const_reference at (size_type __pos) const
constexpr const_reference back () const noexcept
constexpr const_iterator begin () const noexcept
constexpr const_iterator cbegin () const noexcept
constexpr const_iterator cend () const noexcept
constexpr int compare (basic_string_view __str) const noexcept
constexpr int compare (const _CharT *__str) const noexcept
constexpr int compare (size_type __pos1, size_type __n1, basic_string_view __str) const
constexpr int compare (size_type __pos1, size_type __n1, basic_string_view __str, size_type __pos2, size_type __n2) const
constexpr int compare (size_type __pos1, size_type __n1, const _CharT *__str) const
constexpr int compare (size_type __pos1, size_type __n1, const _CharT *__str, size_type __n2) const noexcept(false)
constexpr size_type copy (_CharT *__str, size_type __n, size_type __pos=0) const
constexpr const_reverse_iterator crbegin () const noexcept
constexpr const_reverse_iterator crend () const noexcept
constexpr const_pointer data () const noexcept
constexpr bool empty () const noexcept
constexpr const_iterator end () const noexcept
constexpr bool ends_with (_CharT __x) const noexcept
constexpr bool ends_with (basic_string_view __x) const noexcept
constexpr bool ends_with (const _CharT *__x) const noexcept
constexpr size_type find (_CharT __c, size_type __pos=0) const noexcept
constexpr size_type find (basic_string_view __str, size_type __pos=0) const noexcept
constexpr size_type find (const _CharT *__str, size_type __pos, size_type __n) const noexcept
constexpr size_type find (const _CharT *__str, size_type __pos=0) const noexcept
constexpr size_type find_first_not_of (_CharT __c, size_type __pos=0) const noexcept
constexpr size_type find_first_not_of (basic_string_view __str, size_type __pos=0) const noexcept
constexpr size_type find_first_not_of (const _CharT *__str, size_type __pos, size_type __n) const noexcept
constexpr size_type find_first_not_of (const _CharT *__str, size_type __pos=0) const noexcept
constexpr size_type find_first_of (_CharT __c, size_type __pos=0) const noexcept
constexpr size_type find_first_of (basic_string_view __str, size_type __pos=0) const noexcept
constexpr size_type find_first_of (const _CharT *__str, size_type __pos, size_type __n) const noexcept
constexpr size_type find_first_of (const _CharT *__str, size_type __pos=0) const noexcept
constexpr size_type find_last_not_of (_CharT __c, size_type __pos=npos) const noexcept
constexpr size_type find_last_not_of (basic_string_view __str, size_type __pos=npos) const noexcept
constexpr size_type find_last_not_of (const _CharT *__str, size_type __pos, size_type __n) const noexcept
constexpr size_type find_last_not_of (const _CharT *__str, size_type __pos=npos) const noexcept
constexpr size_type find_last_of (_CharT __c, size_type __pos=npos) const noexcept
constexpr size_type find_last_of (basic_string_view __str, size_type __pos=npos) const noexcept
constexpr size_type find_last_of (const _CharT *__str, size_type __pos, size_type __n) const noexcept
constexpr size_type find_last_of (const _CharT *__str, size_type __pos=npos) const noexcept
constexpr const_reference front () const noexcept
constexpr size_type length () const noexcept
constexpr size_type max_size () const noexcept
constexpr basic_string_view & operator= (const basic_string_view &) noexcept=default
constexpr const_reference operator[] (size_type __pos) const noexcept
constexpr const_reverse_iterator rbegin () const noexcept
constexpr void remove_prefix (size_type __n) noexcept
constexpr void remove_suffix (size_type __n) noexcept
constexpr const_reverse_iterator rend () const noexcept
constexpr size_type rfind (_CharT __c, size_type __pos=npos) const noexcept
constexpr size_type rfind (basic_string_view __str, size_type __pos=npos) const noexcept
constexpr size_type rfind (const _CharT *__str, size_type __pos, size_type __n) const noexcept
constexpr size_type rfind (const _CharT *__str, size_type __pos=npos) const noexcept
constexpr size_type size () const noexcept
constexpr bool starts_with (_CharT __x) const noexcept
constexpr bool starts_with (basic_string_view __x) const noexcept
constexpr bool starts_with (const _CharT *__x) const noexcept
constexpr basic_string_view substr (size_type __pos=0, size_type __n=npos) const noexcept(false)
constexpr void swap (basic_string_view &__sv) noexcept

Static Public Attributes¶

static constexpr size_type npos

template<typename _CharT, typename _Traits = std::char_traits<_CharT>>¶

class std::basic_string_view< _CharT, _Traits >"A non-owning reference to a string.

Template Parameters

A basic_string_view looks like this:

_CharT*    _M_str
size_t     _M_len

Definition at line 100 of file string_view.

template<typename _CharT , typename _Traits = std::char_traits<_CharT>> using std::basic_string_view< _CharT, _Traits >::const_iterator = const value_type*¶

Definition at line 115 of file string_view.

template<typename _CharT , typename _Traits = std::char_traits<_CharT>> using std::basic_string_view< _CharT, _Traits >::const_pointer = const value_type*¶

Definition at line 112 of file string_view.

template<typename _CharT , typename _Traits = std::char_traits<_CharT>> using std::basic_string_view< _CharT, _Traits >::const_reference = const value_type&¶

Definition at line 114 of file string_view.

template<typename _CharT , typename _Traits = std::char_traits<_CharT>> using std::basic_string_view< _CharT, _Traits >::const_reverse_iterator = std::reverse_iterator<const_iterator>¶

Definition at line 117 of file string_view.

template<typename _CharT , typename _Traits = std::char_traits<_CharT>> using std::basic_string_view< _CharT, _Traits >::difference_type = ptrdiff_t¶

Definition at line 120 of file string_view.

template<typename _CharT , typename _Traits = std::char_traits<_CharT>> using std::basic_string_view< _CharT, _Traits >::iterator = const_iterator¶

Definition at line 116 of file string_view.

template<typename _CharT , typename _Traits = std::char_traits<_CharT>> using std::basic_string_view< _CharT, _Traits >::pointer = value_type*¶

Definition at line 111 of file string_view.

template<typename _CharT , typename _Traits = std::char_traits<_CharT>> using std::basic_string_view< _CharT, _Traits >::reference = value_type&¶

Definition at line 113 of file string_view.

template<typename _CharT , typename _Traits = std::char_traits<_CharT>> using std::basic_string_view< _CharT, _Traits >::reverse_iterator = const_reverse_iterator¶

Definition at line 118 of file string_view.

template<typename _CharT , typename _Traits = std::char_traits<_CharT>> using std::basic_string_view< _CharT, _Traits >::size_type = size_t¶

Definition at line 119 of file string_view.

template<typename _CharT , typename _Traits = std::char_traits<_CharT>> using std::basic_string_view< _CharT, _Traits >::traits_type = _Traits¶

Definition at line 109 of file string_view.

template<typename _CharT , typename _Traits = std::char_traits<_CharT>> using std::basic_string_view< _CharT, _Traits >::value_type = _CharT¶

Definition at line 110 of file string_view.

template<typename _CharT , typename _Traits = std::char_traits<_CharT>> constexpr std::basic_string_view< _CharT, _Traits >::basic_string_view () [inline], [constexpr], [noexcept]¶

Definition at line 126 of file string_view.

template<typename _CharT , typename _Traits = std::char_traits<_CharT>> constexpr std::basic_string_view< _CharT, _Traits >::basic_string_view (const _CharT * __str) [inline], [constexpr], [noexcept]¶

Definition at line 133 of file string_view.

template<typename _CharT , typename _Traits = std::char_traits<_CharT>> constexpr std::basic_string_view< _CharT, _Traits >::basic_string_view (const _CharT * __str, size_type __len) [inline], [constexpr], [noexcept]¶

Definition at line 139 of file string_view.

template<typename _CharT , typename _Traits = std::char_traits<_CharT>> template<contiguous_iterator _It, sized_sentinel_for< _It > _End> ¶

requires same_as<iter_value_t<_It>, _CharT> && (!convertible_to<_End, size_type>)constexpr std::basic_string_view< _CharT, _Traits >::basic_string_view (_It __first, _End __last) [inline], [constexpr], [noexcept]"

Definition at line 148 of file string_view.

template<typename _CharT , typename _Traits = std::char_traits<_CharT>> constexpr const_reference std::basic_string_view< _CharT, _Traits >::at (size_type __pos) const [inline], [constexpr]¶

Definition at line 244 of file string_view.

template<typename _CharT , typename _Traits = std::char_traits<_CharT>> constexpr const_reference std::basic_string_view< _CharT, _Traits >::back () const [inline], [constexpr], [noexcept]¶

Definition at line 261 of file string_view.

template<typename _CharT , typename _Traits = std::char_traits<_CharT>> constexpr const_iterator std::basic_string_view< _CharT, _Traits >::begin () const [inline], [constexpr], [noexcept]¶

Definition at line 182 of file string_view.

template<typename _CharT , typename _Traits = std::char_traits<_CharT>> constexpr const_iterator std::basic_string_view< _CharT, _Traits >::cbegin () const [inline], [constexpr], [noexcept]¶

Definition at line 190 of file string_view.

template<typename _CharT , typename _Traits = std::char_traits<_CharT>> constexpr const_iterator std::basic_string_view< _CharT, _Traits >::cend () const [inline], [constexpr], [noexcept]¶

Definition at line 194 of file string_view.

template<typename _CharT , typename _Traits = std::char_traits<_CharT>> constexpr int std::basic_string_view< _CharT, _Traits >::compare (basic_string_view< _CharT, _Traits > __str) const [inline], [constexpr], [noexcept]¶

Definition at line 317 of file string_view.

template<typename _CharT , typename _Traits = std::char_traits<_CharT>> constexpr int std::basic_string_view< _CharT, _Traits >::compare (const _CharT * __str) const [inline], [constexpr], [noexcept]¶

Definition at line 338 of file string_view.

template<typename _CharT , typename _Traits = std::char_traits<_CharT>> constexpr int std::basic_string_view< _CharT, _Traits >::compare (size_type __pos1, size_type __n1, basic_string_view< _CharT, _Traits > __str) const [inline], [constexpr]¶

Definition at line 327 of file string_view.

template<typename _CharT , typename _Traits = std::char_traits<_CharT>> constexpr int std::basic_string_view< _CharT, _Traits >::compare (size_type __pos1, size_type __n1, basic_string_view< _CharT, _Traits > __str, size_type __pos2, size_type __n2) const [inline], [constexpr]¶

Definition at line 331 of file string_view.

template<typename _CharT , typename _Traits = std::char_traits<_CharT>> constexpr int std::basic_string_view< _CharT, _Traits >::compare (size_type __pos1, size_type __n1, const _CharT * __str) const [inline], [constexpr]¶

Definition at line 342 of file string_view.

template<typename _CharT , typename _Traits = std::char_traits<_CharT>> constexpr int std::basic_string_view< _CharT, _Traits >::compare (size_type __pos1, size_type __n1, const _CharT * __str, size_type __n2) const [inline], [constexpr], [noexcept]¶

Definition at line 346 of file string_view.

template<typename _CharT , typename _Traits = std::char_traits<_CharT>> constexpr size_type std::basic_string_view< _CharT, _Traits >::copy (_CharT * __str, size_type __n, size_type __pos = 0) const [inline], [constexpr]¶

Definition at line 297 of file string_view.

template<typename _CharT , typename _Traits = std::char_traits<_CharT>> constexpr const_reverse_iterator std::basic_string_view< _CharT, _Traits >::crbegin () const [inline], [constexpr], [noexcept]¶

Definition at line 206 of file string_view.

template<typename _CharT , typename _Traits = std::char_traits<_CharT>> constexpr const_reverse_iterator std::basic_string_view< _CharT, _Traits >::crend () const [inline], [constexpr], [noexcept]¶

Definition at line 210 of file string_view.

template<typename _CharT , typename _Traits = std::char_traits<_CharT>> constexpr const_pointer std::basic_string_view< _CharT, _Traits >::data () const [inline], [constexpr], [noexcept]¶

Definition at line 268 of file string_view.

template<typename _CharT , typename _Traits = std::char_traits<_CharT>> constexpr bool std::basic_string_view< _CharT, _Traits >::empty () const [inline], [constexpr], [noexcept]¶

Definition at line 231 of file string_view.

template<typename _CharT , typename _Traits = std::char_traits<_CharT>> constexpr const_iterator std::basic_string_view< _CharT, _Traits >::end () const [inline], [constexpr], [noexcept]¶

Definition at line 186 of file string_view.

template<typename _CharT , typename _Traits = std::char_traits<_CharT>> constexpr bool std::basic_string_view< _CharT, _Traits >::ends_with (_CharT __x) const [inline], [constexpr], [noexcept]¶

Definition at line 377 of file string_view.

template<typename _CharT , typename _Traits = std::char_traits<_CharT>> constexpr bool std::basic_string_view< _CharT, _Traits >::ends_with (basic_string_view< _CharT, _Traits > __x) const [inline], [constexpr], [noexcept]¶

Definition at line 368 of file string_view.

template<typename _CharT , typename _Traits = std::char_traits<_CharT>> constexpr bool std::basic_string_view< _CharT, _Traits >::ends_with (const _CharT * __x) const [inline], [constexpr], [noexcept]¶

Definition at line 381 of file string_view.

template<typename _CharT , typename _Traits > constexpr basic_string_view< _CharT, _Traits >::size_type std::basic_string_view< _CharT, _Traits >::find (_CharT __c, size_type __pos = 0) const [constexpr], [noexcept]¶

Definition at line 80 of file bits/string_view.tcc.

template<typename _CharT , typename _Traits = std::char_traits<_CharT>> constexpr size_type std::basic_string_view< _CharT, _Traits >::find (basic_string_view< _CharT, _Traits > __str, size_type __pos = 0) const [inline], [constexpr], [noexcept]¶

Definition at line 403 of file string_view.

template<typename _CharT , typename _Traits > constexpr basic_string_view< _CharT, _Traits >::size_type std::basic_string_view< _CharT, _Traits >::find (const _CharT * __str, size_type __pos, size_type __n) const [constexpr], [noexcept]¶

Definition at line 47 of file bits/string_view.tcc.

template<typename _CharT , typename _Traits = std::char_traits<_CharT>> constexpr size_type std::basic_string_view< _CharT, _Traits >::find (const _CharT * __str, size_type __pos = 0) const [inline], [constexpr], [noexcept]¶

Definition at line 413 of file string_view.

template<typename _CharT , typename _Traits > constexpr basic_string_view< _CharT, _Traits >::size_type std::basic_string_view< _CharT, _Traits >::find_first_not_of (_CharT __c, size_type __pos = 0) const [constexpr], [noexcept]¶

Definition at line 185 of file bits/string_view.tcc.

template<typename _CharT , typename _Traits = std::char_traits<_CharT>> constexpr size_type std::basic_string_view< _CharT, _Traits >::find_first_not_of (basic_string_view< _CharT, _Traits > __str, size_type __pos = 0) const [inline], [constexpr], [noexcept]¶

Definition at line 464 of file string_view.

template<typename _CharT , typename _Traits > constexpr basic_string_view< _CharT, _Traits >::size_type std::basic_string_view< _CharT, _Traits >::find_first_not_of (const _CharT * __str, size_type __pos, size_type __n) const [constexpr], [noexcept]¶

Definition at line 172 of file bits/string_view.tcc.

template<typename _CharT , typename _Traits = std::char_traits<_CharT>> constexpr size_type std::basic_string_view< _CharT, _Traits >::find_first_not_of (const _CharT * __str, size_type __pos = 0) const [inline], [constexpr], [noexcept]¶

Definition at line 476 of file string_view.

template<typename _CharT , typename _Traits = std::char_traits<_CharT>> constexpr size_type std::basic_string_view< _CharT, _Traits >::find_first_of (_CharT __c, size_type __pos = 0) const [inline], [constexpr], [noexcept]¶

Definition at line 435 of file string_view.

template<typename _CharT , typename _Traits = std::char_traits<_CharT>> constexpr size_type std::basic_string_view< _CharT, _Traits >::find_first_of (basic_string_view< _CharT, _Traits > __str, size_type __pos = 0) const [inline], [constexpr], [noexcept]¶

Definition at line 431 of file string_view.

template<typename _CharT , typename _Traits > constexpr basic_string_view< _CharT, _Traits >::size_type std::basic_string_view< _CharT, _Traits >::find_first_of (const _CharT * __str, size_type __pos, size_type __n) const [constexpr], [noexcept]¶

Definition at line 133 of file bits/string_view.tcc.

template<typename _CharT , typename _Traits = std::char_traits<_CharT>> constexpr size_type std::basic_string_view< _CharT, _Traits >::find_first_of (const _CharT * __str, size_type __pos = 0) const [inline], [constexpr], [noexcept]¶

Definition at line 443 of file string_view.

template<typename _CharT , typename _Traits > constexpr basic_string_view< _CharT, _Traits >::size_type std::basic_string_view< _CharT, _Traits >::find_last_not_of (_CharT __c, size_type __pos = npos) const [constexpr], [noexcept]¶

Definition at line 218 of file bits/string_view.tcc.

template<typename _CharT , typename _Traits = std::char_traits<_CharT>> constexpr size_type std::basic_string_view< _CharT, _Traits >::find_last_not_of (basic_string_view< _CharT, _Traits > __str, size_type __pos = npos) const [inline], [constexpr], [noexcept]¶

Definition at line 483 of file string_view.

template<typename _CharT , typename _Traits > constexpr basic_string_view< _CharT, _Traits >::size_type std::basic_string_view< _CharT, _Traits >::find_last_not_of (const _CharT * __str, size_type __pos, size_type __n) const [constexpr], [noexcept]¶

Definition at line 196 of file bits/string_view.tcc.

template<typename _CharT , typename _Traits = std::char_traits<_CharT>> constexpr size_type std::basic_string_view< _CharT, _Traits >::find_last_not_of (const _CharT * __str, size_type __pos = npos) const [inline], [constexpr], [noexcept]¶

Definition at line 495 of file string_view.

template<typename _CharT , typename _Traits = std::char_traits<_CharT>> constexpr size_type std::basic_string_view< _CharT, _Traits >::find_last_of (_CharT __c, size_type __pos = npos) const [inline], [constexpr], [noexcept]¶

Definition at line 452 of file string_view.

template<typename _CharT , typename _Traits = std::char_traits<_CharT>> constexpr size_type std::basic_string_view< _CharT, _Traits >::find_last_of (basic_string_view< _CharT, _Traits > __str, size_type __pos = npos) const [inline], [constexpr], [noexcept]¶

Definition at line 447 of file string_view.

template<typename _CharT , typename _Traits > constexpr basic_string_view< _CharT, _Traits >::size_type std::basic_string_view< _CharT, _Traits >::find_last_of (const _CharT * __str, size_type __pos, size_type __n) const [constexpr], [noexcept]¶

Definition at line 150 of file bits/string_view.tcc.

template<typename _CharT , typename _Traits = std::char_traits<_CharT>> constexpr size_type std::basic_string_view< _CharT, _Traits >::find_last_of (const _CharT * __str, size_type __pos = npos) const [inline], [constexpr], [noexcept]¶

Definition at line 460 of file string_view.

template<typename _CharT , typename _Traits = std::char_traits<_CharT>> constexpr const_reference std::basic_string_view< _CharT, _Traits >::front () const [inline], [constexpr], [noexcept]¶

Definition at line 254 of file string_view.

template<typename _CharT , typename _Traits = std::char_traits<_CharT>> constexpr size_type std::basic_string_view< _CharT, _Traits >::length () const [inline], [constexpr], [noexcept]¶

Definition at line 220 of file string_view.

template<typename _CharT , typename _Traits = std::char_traits<_CharT>> constexpr size_type std::basic_string_view< _CharT, _Traits >::max_size () const [inline], [constexpr], [noexcept]¶

Definition at line 224 of file string_view.

template<typename _CharT , typename _Traits = std::char_traits<_CharT>> constexpr const_reference std::basic_string_view< _CharT, _Traits >::operator[] (size_type __pos) const [inline], [constexpr], [noexcept]¶

Definition at line 237 of file string_view.

template<typename _CharT , typename _Traits = std::char_traits<_CharT>> constexpr const_reverse_iterator std::basic_string_view< _CharT, _Traits >::rbegin () const [inline], [constexpr], [noexcept]¶

Definition at line 198 of file string_view.

template<typename _CharT , typename _Traits = std::char_traits<_CharT>> constexpr void std::basic_string_view< _CharT, _Traits >::remove_prefix (size_type __n) [inline], [constexpr], [noexcept]¶

Definition at line 274 of file string_view.

template<typename _CharT , typename _Traits = std::char_traits<_CharT>> constexpr void std::basic_string_view< _CharT, _Traits >::remove_suffix (size_type __n) [inline], [constexpr], [noexcept]¶

Definition at line 282 of file string_view.

template<typename _CharT , typename _Traits = std::char_traits<_CharT>> constexpr const_reverse_iterator std::basic_string_view< _CharT, _Traits >::rend () const [inline], [constexpr], [noexcept]¶

Definition at line 202 of file string_view.

template<typename _CharT , typename _Traits > constexpr basic_string_view< _CharT, _Traits >::size_type std::basic_string_view< _CharT, _Traits >::rfind (_CharT __c, size_type __pos = npos) const [constexpr], [noexcept]¶

Definition at line 116 of file bits/string_view.tcc.

template<typename _CharT , typename _Traits = std::char_traits<_CharT>> constexpr size_type std::basic_string_view< _CharT, _Traits >::rfind (basic_string_view< _CharT, _Traits > __str, size_type __pos = npos) const [inline], [constexpr], [noexcept]¶

Definition at line 417 of file string_view.

template<typename _CharT , typename _Traits > constexpr basic_string_view< _CharT, _Traits >::size_type std::basic_string_view< _CharT, _Traits >::rfind (const _CharT * __str, size_type __pos, size_type __n) const [constexpr], [noexcept]¶

Definition at line 96 of file bits/string_view.tcc.

template<typename _CharT , typename _Traits = std::char_traits<_CharT>> constexpr size_type std::basic_string_view< _CharT, _Traits >::rfind (const _CharT * __str, size_type __pos = npos) const [inline], [constexpr], [noexcept]¶

Definition at line 427 of file string_view.

template<typename _CharT , typename _Traits = std::char_traits<_CharT>> constexpr size_type std::basic_string_view< _CharT, _Traits >::size () const [inline], [constexpr], [noexcept]¶

Definition at line 216 of file string_view.

template<typename _CharT , typename _Traits = std::char_traits<_CharT>> constexpr bool std::basic_string_view< _CharT, _Traits >::starts_with (_CharT __x) const [inline], [constexpr], [noexcept]¶

Definition at line 360 of file string_view.

template<typename _CharT , typename _Traits = std::char_traits<_CharT>> constexpr bool std::basic_string_view< _CharT, _Traits >::starts_with (basic_string_view< _CharT, _Traits > __x) const [inline], [constexpr], [noexcept]¶

Definition at line 356 of file string_view.

template<typename _CharT , typename _Traits = std::char_traits<_CharT>> constexpr bool std::basic_string_view< _CharT, _Traits >::starts_with (const _CharT * __x) const [inline], [constexpr], [noexcept]¶

Definition at line 364 of file string_view.

template<typename _CharT , typename _Traits = std::char_traits<_CharT>> constexpr basic_string_view std::basic_string_view< _CharT, _Traits >::substr (size_type __pos = 0, size_type __n = npos) const [inline], [constexpr], [noexcept]¶

Definition at line 309 of file string_view.

template<typename _CharT , typename _Traits = std::char_traits<_CharT>> constexpr void std::basic_string_view< _CharT, _Traits >::swap (basic_string_view< _CharT, _Traits > & __sv) [inline], [constexpr], [noexcept]¶

Definition at line 286 of file string_view.

template<typename _CharT , typename _Traits = std::char_traits<_CharT>> constexpr size_type std::basic_string_view< _CharT, _Traits >::npos [static], [constexpr]¶

Definition at line 121 of file string_view.